Home › Forum › Ask A Member › 1979 Johnson 140 Carb sync › Re: 1979 Johnson 140 Carb sync
Yes, there is a specific point where the throttles should begin to open. The carbs must be synchronized, and the pick up timing must be set as well. Again, these specific adjustments won’t affect idle to full acceleration performance much, but you do need to make sure the throttles are opening fully and the timer base is hitting its full advance stop.
The sidewinder is a short performance hull that does tend to "squat" when accelerated, popping the bow up severely before getting on plane, which makes finding the right prop difficult. The prop that provides best WOT throttle performance will probably be the worst for acceleration. This rig will probably have to be under propped a bit to provide satisfactory acceleration, especially for water skiing.
The place to start here is knowing the prop style and pitch, along with WOT RPM when properly trimmed out. I will look to see if I have a manual for this engine, perhaps I can post a few of the synchronization pages….